Activated biochar obtained through slow pyrolysis and subsequent activation with CO2 was chosen as support in the synthesis of low Ni-content catalysts to be employed in CO2 methanation process. The main aim of this work was to obtain a more sustainable catalytic formulation compared to those proposed in literature. Biochar-supported catalyst resulted to be efficient in CO2 methanation, but with a relatively low selectivity toward methane. Support doping with CeO2 led to a remarkable increase in methane yield and in stability overtime. A maximum CH4 production was achieved with a CeO2 loading of 30 wt.%. Nevertheless, the lowest deactivation rate was observed for a support loaded with 50 wt.% of CeO2 Ceria promotes a faster activation of the CO2 molecule and a strengthens the Ni/support interactions, resulting in reduced active phase mobility and moderate sintering phenomena. The outcomes of this work were attractive for further studies related to the improvements in the catalyst stability.

Biochar as support in catalytic CO2 methanation: Enhancing effect of CeO2 addition

Renda S.;Di Stasi C.;Palma V.
2021

Abstract

Activated biochar obtained through slow pyrolysis and subsequent activation with CO2 was chosen as support in the synthesis of low Ni-content catalysts to be employed in CO2 methanation process. The main aim of this work was to obtain a more sustainable catalytic formulation compared to those proposed in literature. Biochar-supported catalyst resulted to be efficient in CO2 methanation, but with a relatively low selectivity toward methane. Support doping with CeO2 led to a remarkable increase in methane yield and in stability overtime. A maximum CH4 production was achieved with a CeO2 loading of 30 wt.%. Nevertheless, the lowest deactivation rate was observed for a support loaded with 50 wt.% of CeO2 Ceria promotes a faster activation of the CO2 molecule and a strengthens the Ni/support interactions, resulting in reduced active phase mobility and moderate sintering phenomena. The outcomes of this work were attractive for further studies related to the improvements in the catalyst stability.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11386/4782884
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